Check in initial model stuff, unused

Makefile.am

@@ -6,5 +6,3 @@ sugardir = $(pythondir)/sugar
 sugar_PYTHON =			\
 	__init__.py		\
 	sugar_globals.py
-
-EXTRA_DIST = sugar

chat/model.py

@@ -0,0 +1,116 @@
+import p2p
+
+class ModelListener:
+	def __init__(self):
+		pass
+	
+	def model_changed(self, key, value):
+		pass
+
+class Model:
+	def __init__(self):
+		creator = Owner.getInstance()
+		self._uri = "urn:model:" + creator.get_id() + ":" + random()
+		self._values = {}
+		self.__listeners = []
+
+	def get_value(self, key):
+		return self._values[key]
+		
+	def set_value(self, key, value):
+		self._values[key] = value
+		notify_changed(key, value)
+		
+	def add_listener(self, listener):
+		self.__listeners.add(listener)
+		
+	def notify_changed(self, key, value):
+		for listener in self.__listeners:
+			listener.model_changed(key, value)
+
+	def serialize(model):
+		return [ self._uri, self._values ]
+	
+	serialize = staticmethod(serialize)
+
+	def deserialize(data):
+		[uri, values] = data
+
+		# FIXME How damn I do this right in python?
+		model = Model()
+		model._uri = uri
+		model._values = values
+
+		return model
+	
+	deserialize = staticmethod(deserialize)
+
+class ModelChangeSet:
+	def __init__(self):
+		self._values = {}
+		
+	def add(self, key, value):
+		self._values[key] = value
+
+class ClientModelListener(ModelListener):
+	def __init__(self, client, model):
+		self._model = model
+	
+	def model_changed(self, key, value):
+		client.add_change(self._model, key, value)
+
+class ModelStore:
+	instance = None
+	
+	def __init__(self):
+		self._models = {}
+		self._group = p2p.Group.get_instance()
+
+		input_pipe = p2p.InputPipe(self._group, "model-store")
+		input_pipe.listen(self._model_request)
+	
+	def get_instance():
+		if not ModelStore.instance:
+			ModelStore.instance = ModelStore()
+		return ModelStore.instance
+		
+	get_instance = staticmethod(get_instance)
+
+	def add_model(self, model):
+		self._models[model.get_id(), model]
+
+	def _model_request(self, buddy, msg):
+		parts = msg.split(':')
+		model_id = self._group.get_buddy(parts[3])
+		model = self._models[model_id]
+		return model.serialize()
+
+class ModelContext:
+	def __init__(self):
+		self._store = ModelStore.get_instance()
+		self._changes = {}
+	
+	def _add_model(self, model):
+		self._store.add_model(model)
+		
+		change_set = ModelChangeSet()
+		self.__changes[model_id, change_set]
+		
+		listener = ClientModelListener(self)
+		model.add_listener(listener)
+	
+	def fetch(self, model_uri):
+		parts = model_uri.split(':')
+		buddy = Group.get_instance().get_buddy(parts[2])
+
+		output_pipe = p2p.OutputPipe(group, buddy, "model-store")
+		model = output_pipe.send(model_uri)
+
+		self._add_model(model)
+		
+	def commit(self):
+		pass
+	
+	def add_change(self, model, key, value):
+		change_set = self.__changes[model.get_id()]
+		change_set.add(key, value)